interface operation guide for levelpro with hart...

Part of Thermo Fisher Scientific

LevelPRO With HART® ProtocolInterface Operation GuideP/N 717817

Revision C

LevelPRO With HART® ProtocolInterface Operation GuideP/N 717817

Revision C

© 2011 Thermo Fisher Scientific Inc. All rights reserved.

“Microsoft” and “Windows” are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. “HART” is a registered trademark of the HART Communication Foundation. “Motorola” is a registered trademark of Motorola, Inc.

All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

Thermo Fisher Scientific Inc. (Thermo Fisher) makes every effort to ensure the accuracy and completeness of this manual. However, we cannot be responsible for errors, omissions, or any loss of data as the result of errors or omissions. Thermo Fisher reserves the right to make changes to the manual or improvements to the product at any time without notice.

The material in this manual is proprietary and cannot be reproduced in any form without expressed written consent from Thermo Fisher.

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Thermo Fisher Scientific LevelPRO HART Operation Guide v

Revision History

Revision Level Date Comments

1.0 05-2001 Initial release.

A 03-2006 Per ECO 5119.

B 10-2007 Per ECO 6000.

C 02-2011 Per ECO 7649.

Thermo Fisher Scientific LevelPRO HART Operation Guide vii

Contents Chapter 1 Overview............................................................................................................. 1-1

Introduction........................................................................................ 1-1 Terms.................................................................................................. 1-1 Theory of Operation ........................................................................... 1-2

HART Board ................................................................................... 1-2 LevelPRO DD ................................................................................. 1-2 Gauge .............................................................................................. 1-2

Contact Information ........................................................................... 1-3

Instrument Setup with HART .......................................................................... 2-1 Chapter 2

Chapter 3 HART Multi-Drop Mode ................................................................................... 3-1 HART Unique ID .............................................................................. 3-1 HART Polling Address ....................................................................... 3-1 Exit Multi-Drop.................................................................................. 3-1 Limitations in Multi-Drop Mode........................................................ 3-2

Certifications ..................................................................................................... 4-1 Chapter 4

Appendix A LevelPRO DD Flowcharts ............................................................................... A-1

Chapter 1

Overview

Introduction troduction This manual describes the setup and operation of the optional HART interface for the Thermo Scientific LevelPRO continuous gamma level system. This interface includes:

● HART interface, which consists of a Motorola 68HC12 P and interface circuitry to both the instrument and the HART bus. This board mounts to the gauge housing and attaches to the CPU board with a ribbon cable.

● LevelPRO HART Device Description (DD), which offers access to the instrument’s measurement data and basic setup functions. This DD is typically loaded into the 275 / 375 (or later) Field Communicator from Emerson Electric Co.

Note It is assumed that readers have a basic familiarity with the gauge. If necessary, refer to the LevelPRO user guide (p/n 717778). ▲

Terms Terms The following terms are used in this document:

● HART: An acronym for Highway Addressable Remote Transducer. The protocol is maintained by the HART Communication Foundation.

● Device Description (DD): A program script that contains the menus/methods for interacting with a HART instrument. The 275 / 375 (or later) Field Communicator has a built-in interpreter to run DD scripts. The LevelPRO DD is referred to as LevelPRO DD.

● HART board: The LevelPRO HART interface.

● 275 / 375 / later: The 275 / 375 (or later) Field Communicator from Emerson Electric Co.

Thermo Fisher Scientific LevelPRO HART Operation Guide 1-1

Overview Theory of Operation

Theory of Operation HART Board

The HART board serves as an intelligent pass-through between the “external” HART world and the gauge. It has three responsibilities:

● Maintain a local copy of all gauge setup data for fast retrieval.

● Offer real-time access to the gauge’s process and alarm data.

● Translate incoming HART requests to the equivalent native gauge requests, collect the data, and send the response to the HART requestor.

On the gauge side, the HART board co-opts the gauge’s RS232 port and talks to it in logic levels in the usual ASYNC format. On the HART side, the HART telemetry is “mixed” with the gauge’s 4–20 mA current out. The HART master (usually the 275/375/later field communicator) talks to the gauge over its current loop.

LevelPRO DD The LevelPRO DD is designed to offer access to the gauge’s process data and basic setup functions, including:

● Primary measurement setup

● Process alarms

● Additional measurements

● Current output settings

● Gauge fine tuning

● Action items (gauge restart, erase memory)

As practical, the DD menu structure mirrors that found in the gauge. The DD menu flowcharts appear in Appendix A.

Gauge Once the HART board is installed, the gauge enters a special mode of operation by:

● Overriding all user RS232 selections and setting the port to 96007E1, Blind Mode, data streaming inhibited.

● Disabling all RS232 setup menus in the gauge user system.

● Enabling HART board software watchdog, which monitors HART board data requests. The watchdog will raise a system fault alarm if there were no requests received in a one-minute interval.

1-2 LevelPRO HART Operation Guide Thermo Fisher Scientific

Overview Contact Information


If you have questions or require additional technical support, contact Thermo Fisher. Contact

Information

Process Instruments

1410 Gillingham Lane Sugar Land, TX 77478 USA +1 (800) 437-7979 +1 (713) 272-0404 direct +1 (713) 4573 fax

14 Gormley Industrial Avenue Gormley, Ontario L0H 1G0 CANADA +1 (905) 888-8808 +1 (905) 888-8828 fax

Unit 702-715, 7/F Tower West Yonghe Plaza No. 28 Andingmen East Street, Beijing 100007 CHINA +86 (10) 8419-3588 +86 (10) 8419-3580 fax

A-101, 1CC Trade Tower Senapati Bapat Road Pune 411 016 Maharashtra, INDIA +91 (20) 6626 7000 +91 (20) 6626 7001 fax

Ion Path, Road Three Winsford, Cheshire CW7 3GA UNITED KINGDOM +44 (0) 1606 548700 +44 (0) 1606 548711 fax

www.thermoscientific.com


Chapter 2

Instrument Setup with HART

To facilitate ease of use, the LevelPRO DD was specifically modeled from the gauge’s built-in menu system. Refer to Appendix A for details.

Chapter 3

HART Multi-Drop Mode

The LevelPRO HART supports the HART multi-drop mode where up to 15 slaves can be interconnected on a single current loop. While in this mode, the gauge parks its current out at 3.8 mA. Each slave must be assigned an individual unique ID and polling address to be accessed by a HART Master.

HART Unique ID The unique ID is a 24-bit number that the HART protocol uses to distinguish between slaves in the long-addressing format. The gauge stores this ID in non-volatile (NV) RAM. It is shipped with an ID of 0. At power-up, the HART board reads this ID from the gauge.

The ID may be set via the gauge’s built-in user interface, with the Thermo Scientific 9734 RS485 handheld. To set a unique ID using direct entry:

1. Enable the protected NV section (0050101).

2. Assign a non-zero HART unique ID (019015 SN, where SN is a 24-bit hexadecimal number from 1 to 0xFFFFFF).

HART Polling Address

The polling address is an 8-bit number (0–15), which is used to distinguish between slaves in the short-addressing format. The polling address resides in the HART board’s NVRAM. The FR275/375/later is typically used to assign the polling address (refer to the FR275/375/later user guide). Once the polling address is assigned, the gauge parks its current out at 3.8 mA.

Exit Multi-Drop Exit multi-drop mode by restoring the gauge’s polling address to zero. Afterward, the current out operation returns to normal.


HART Multi-Drop Mode Limitations in Multi-Drop Mode

3-2 LevelPRO HART Operation Guide Thermo Fisher Scientific

Limitations in Multi-Drop Mode

While in multi-drop mode, the gauge current output will not:

● Track the measurement (PV)

● Perform user current hold commands

● Perform current out alarm actions (go to Fault Low/Fault High)

Chapter 4

Certifications

The LevelPRO HART conforms to the HART Physical Layer Specification Rev. 5.0.


Appendix A

LevelPRO DD Flowcharts

The LevelPRO DD is designed to offer access to the gauge’s process data and basic setup functions. The DD menu flowcharts appear on the following pages.

Thermo Fisher Scientific LevelPRO HART Operation Guide A-1


A-2 LevelPRO HART Operation Guide Thermo Fisher Scientific

Thermo Fisher Scientific81 Wyman StreetP.O. Box 9046Waltham, Massachusetts 02454-9046United States

www.thermofisher.com

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